<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script src="./js/vue.js"></script>
    <style>
        #app {
            border: 2px solid black;
            padding: 10px;
            margin-bottom: 400px;
        }

        .child {
            margin: 20px;
            padding: 10px;
            background-color: #cccccc;
        }
    </style>

</head>

<body>
    <div id="app">
        <h3>父组件范围</h3>
        <p>msg:{{ msg }}</p>
        <child-one @send-msg="loadMsg"></child-one>
        <child-two :msg=" msg "></child-two>

    </div>

    <template id="ChildOne">
        <div class="child">
            <h3>子组件</h3>
            <p>msg:{{ msg }}</p>
            <input type="button" value="发送msg变量" @click=" $emit('send-msg',msg) ">
        </div>
    </template>
    <template id="ChildTwo">
        <div class="child">
            <h3>子组件</h3>
            <p>msg:{{ msg }}</p>
        </div>
    </template>
</body>
<script>
    Vue.component("ChildOne",{
        template:"#ChildOne",
        data(){
            return {
                msg: "测试数据"
            }
        },
        mounted() {
            // this.$emit('send-msg',this.msg);
        },
    })
    Vue.component("ChildTwo",{
        template:"#ChildTwo",
        props:["msg"]
    })

    new Vue({
        el:"#app",
        data:{
            msg:""
        },
        methods: {
            loadMsg(arg){
                this.msg = arg;
            }
        },
    })
</script>
</html>